[PATCH v4 2/3] arm64: vmlinux.ld: Add .mmuoff.{text, data} sections

Actually, it is not even necessary to align the end of .mmuoff.data,
as long as the next section starts at at 2 KB aligned boundary (which
is guaranteed for .bss since it covers page aligned data, although it
would make sense to make that explicit) I.e., something like

diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 659963d40bb4..70aa77060729 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S

@@ -185,10 +185,18 @@ SECTIONS
        _data = .;
        _sdata = .;
        RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
+
+       .mmuoff.read : ALIGN(SZ_2K) {
+               *(.mmuoff.read)
+       }
+       .mmuoff.write : ALIGN(SZ_2K) {
+               *(.mmuoff.write)
+       }
+
        PECOFF_EDATA_PADDING
        _edata = .;

-       BSS_SECTION(0, 0, 0)
+       BSS_SECTION(SZ_2K, SZ_2K, 0)

        . = ALIGN(PAGE_SIZE);
        idmap_pg_dir = .;

AFAICT, this should allow you to drop the alignments in the code. This
is also more future proof, since you can simply emit variables into
these sections anywhere, whereas the explicit .align directive aligns
that particular variable, which could lead to more waste of space.